TWI679799B - Mobile device - Google Patents

Abstract

A mobile device includes: a metal back cover, a dielectric substrate, a grounded metal portion, a first radiation portion, and a second radiation portion. The metal back cover has a slot. The dielectric substrate has a first surface and a second surface opposite to each other, and the second surface faces the slot. The ground metal portion extends onto the first surface of the dielectric substrate. The first radiating portion has a feeding point and is disposed on the first surface of the dielectric substrate. A first vertical projection system of the first radiation part on the metal back cover at least partially overlaps with the slot. The second radiation portion is disposed on the second surface of the dielectric substrate. A second vertical projection system of the second radiating part on the metal back cover at least partially overlaps the slot. The first radiating portion, the second radiating portion, and the slot of the metal back cover together form an antenna structure.

Description

Mobile device

The present invention relates to a mobile device, and more particularly to a mobile device and an antenna structure thereof.

With the development of mobile communication technology, mobile devices have become more and more common in recent years. Common examples include: portable computers, mobile phones, multimedia players, and other portable electronic devices with mixed functions. In order to meet people's needs, mobile devices usually have the function of wireless communication. Some cover long-range wireless communication ranges, for example: mobile phones use 2G, 3G, LTE (Long Term Evolution) systems and the 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz, and 2500MHz frequency bands to communicate, Some cover short-range wireless communication ranges, such as: Wi-Fi, Bluetooth systems use the 2.4GHz, 5.2GHz, and 5.8GHz bands for communication.

In order to pursue beautiful appearance, designers today often add elements of metal elements to mobile devices. However, the added metal components are likely to have a negative impact on the antenna supporting wireless communication in the mobile device, thereby reducing the overall communication quality of the mobile device. Therefore, it is necessary to propose a new mobile device and antenna structure to overcome the problems faced by traditional technologies.

In a preferred embodiment, the present invention provides a mobile device, including Including: a metal back cover with a slot hole; a dielectric substrate having a first surface and a second surface opposite to each other, wherein the second surface of the dielectric substrate faces the slot hole; a ground metal portion, coupling Connected to the metal back cover and extending to the first surface of the dielectric substrate; a first radiating portion having a feeding point and disposed on the first surface of the dielectric substrate, wherein the first radiation A first vertical projection system on the metal back cover at least partially overlaps the slot, and a coupling gap is formed between the first radiation part and the ground metal part; and a second radiation part is disposed on the On the second surface of the dielectric substrate, a second vertical projection of the second radiation portion on the metal back cover at least partially overlaps the slot; wherein the first radiation portion and the second radiation portion And the slot of the metal back cover together form an antenna structure.

In some embodiments, the slot is a closed slot.

In some embodiments, the first vertical projection of the first radiation portion and the second vertical projection of the second radiation portion at least partially overlap.

In some embodiments, the ground metal portion is a ground copper foil.

In some embodiments, the first radiating portion is T-shaped.

In some embodiments, the second radiating portion is T-shaped.

In some embodiments, the mobile device further includes: a first penetrating element penetrating the dielectric substrate, wherein the first penetrating element is coupled between the first radiating portion and the second radiating portion.

In some embodiments, the mobile device further includes: a third radiating portion coupled to the first radiating portion and disposed on the first surface of the dielectric substrate, wherein the third radiating portion is on the metal back A third vertical projection system covered at least partially overlaps the slot.

In some embodiments, the third radiating portion is rectangular.

In some embodiments, the antenna structure includes a first frequency band and a second frequency band, the first frequency band is between 2400 MHz and 2500 MHz, and the second frequency band is between 5150 MHz and 5850 MHz.

In some embodiments, the first radiating portion, the second radiating portion, the third radiating portion, and the slot of the metal back cover are used to excite the first frequency band.

In some embodiments, the first radiating portion, the second radiating portion, and the third radiating portion are used to excite the second frequency band.

In some embodiments, the length of the slot is equal to 0.5 times the wavelength of the first frequency band.

In some embodiments, the second radiating portion is floating and presents an L-shape.

In some embodiments, the ground metal portion has an extending portion on the first surface of the dielectric substrate, and the extending portion has a straight bar shape or an L shape.

In some embodiments, the coupling gap formed between the first radiation portion and the extension portion of the ground metal portion is less than 3.5 mm.

In some embodiments, the mobile device further includes: a fourth radiation portion disposed on the second surface of the dielectric substrate, wherein the fourth radiation portion is a fourth vertical projection system on the metal back cover and The slot holes at least partially overlap.

In some embodiments, the fourth radiating portion has an inverted T shape.

In some embodiments, the mobile device further includes: a second penetrating element penetrating the dielectric substrate, wherein the second penetrating element is coupled to the extension portion of the ground metal portion and the fourth radiation portion between.

In some embodiments, the thickness of the dielectric substrate is less than 0.8 mm.

100, 400, 500, 600, 700, 800‧‧‧ mobile devices

110‧‧‧metal back cover

120‧‧‧Slot

121‧‧‧ the first closed end of the slot

122‧‧‧The second closed end of the slot

130‧‧‧ Dielectric substrate

140, 740‧‧‧ Grounded Metal Division

145, 745‧‧‧ extension of ground metal part

150‧‧‧First Radiation Department

151‧‧‧ the first end of the first radiation department

152‧‧‧ the second end of the first radiation department

153‧‧‧ the third end of the first radiation department

160, 560‧‧‧Second Radiation Department

161, 561‧‧‧ the first end of the second radiation unit

162, 562‧‧‧ Second end of the second radiation department

163‧‧‧The third end of the second radiation department

170‧‧‧ Third Radiation Department

181‧‧‧First through element

182‧‧‧Second through element

190‧‧‧plastic support element

199‧‧‧Signal Source

860‧‧‧Fourth Radiation Department

861‧‧‧ the first end of the fourth radiation department

862‧‧‧ the second end of the fourth radiation department

863‧‧‧ the third end of the fourth radiation department

E1‧‧‧ the first surface of the dielectric substrate

E2‧‧‧Second surface of dielectric substrate

FB1‧‧‧First Band

FB2‧‧‧Second Band

FP‧‧‧feed point

GC1, GC2‧‧‧Coupling gap

H1‧‧‧ height

TK1‧‧‧thickness

W1‧‧‧Width

FIG. 1A is a top view of a mobile device according to an embodiment of the present invention.

FIG. 1B is a side view showing a mobile device according to an embodiment of the present invention.

FIG. 2A is a schematic diagram illustrating a mobile device operating in a notebook mode according to an embodiment of the present invention.

FIG. 2B is a schematic diagram illustrating a mobile device operating in a tablet mode according to an embodiment of the present invention.

FIG. 3A is a graph showing a voltage standing wave ratio of an antenna structure when the mobile device according to an embodiment of the present invention is operated in a notebook mode.

FIG. 3B is a graph showing a voltage standing wave ratio of an antenna structure when the mobile device according to an embodiment of the present invention is operated in a tablet mode.

FIG. 4 is a top view of a mobile device according to an embodiment of the present invention.

FIG. 5 is a top view of a mobile device according to an embodiment of the present invention.

FIG. 6 is a plan view showing a mobile device according to an embodiment of the present invention Illustration.

FIG. 7 is a top view of a mobile device according to an embodiment of the present invention.

FIG. 8 is a top view of a mobile device according to an embodiment of the present invention.

In order to make the objects, features, and advantages of the present invention more comprehensible, specific embodiments of the present invention are specifically listed below, and described in detail with the accompanying drawings.

Certain terms are used in the description and the scope of patent applications to refer to specific elements. Those skilled in the art will understand that hardware manufacturers may use different terms to refer to the same component. The scope of this specification and the patent application does not use the difference in names as a way to distinguish components, but rather uses the difference in functions of components as a criterion for distinguishing components. The terms "including" and "including" mentioned throughout the specification and the scope of patent applications are open-ended terms and should be interpreted as "including but not limited to." The term "approximately" means that within the acceptable error range, those skilled in the art can solve the technical problem within a certain error range and achieve the basic technical effect. In addition, the term "coupled" includes any direct and indirect electrical connection means in this specification. Therefore, if a first device is described as being coupled to a second device, it means that the first device can be electrically connected directly to the second device, or indirectly electrically connected to the first device via other devices or connection means.二 装置。 Two devices.

FIG. 1A is a top view of a mobile device 100 according to an embodiment of the present invention. Figure 1B shows a trip according to an embodiment of the invention Side view of the moving device 100. Please refer to Figures 1A and 1B together. The mobile device 100 may be a smart phone, a tablet computer, or a notebook computer. In the embodiment shown in FIGS. 1A and 1B, the mobile device 100 includes a metal back cover 110, a dielectric substrate 130, a grounding metal element 140, and a first Radiation element 150, a second radiation part 160, and a third radiation part 170, wherein the first radiation part 150, the second radiation part 160, and the third radiation part 170 can be made of metal materials, For example: copper, silver, aluminum, iron, or alloys thereof. It must be understood that although not shown in Figures 1A and 1B, the mobile device 100 may actually include other components, such as a processor, a touch control panel, and a speaker ( Speaker), a battery module, and a housing.

The metal back cover 110 has a slot 120, wherein the slot 120 may be a substantially straight strip-shaped opening. In detail, the slot 120 is a closed slot, which has a first closed end 121 and a second closed end 122 that are far away from each other. However, the present invention is not limited to this. In other embodiments, the slot 120 can also be changed to a monopole slot, which has an open end and a closed end away from each other. If the mobile device 100 is implemented in a laptop or a deformable device, an edge of the metal back cover 110 may be adjacent to a hinge element (not shown) of the laptop or the deformable device. For example, the distance between the edge of the metal back cover 110 and the shaft element may be less than 10 mm.

The dielectric substrate 130 may be a FR4 (Flame Retardant 4) substrate, A printed circuit board (Printed Circuit Board, PCB) or a flexible circuit board (Flexible Circuit Board, FCB). The dielectric substrate 130 has a first surface E1 and a second surface E2 opposite to each other. The first radiation portion 150 and the third radiation portion 170 are both disposed on the first surface E1 of the dielectric substrate 130. The second radiation portion 160 is It is disposed on the second surface E2 of the dielectric substrate 130. The second surface E2 of the dielectric substrate 130 can further face and be adjacent to the slot 120 of the metal back cover 110, so that the first radiating portion 150, the second radiating portion 160, the third radiating portion 170, and the slot of the metal back cover 110 120 can collectively form an antenna structure. It must be noted that the term "adjacent" or "adjacent" in this specification may refer to the distance between the corresponding two components being less than a predetermined distance (for example: 5mm or less), and may also include the corresponding two components directly contacting each other Case (that is, the aforementioned pitch is shortened to 0). The ground metal portion 140 may be coupled to the metal back cover 110, and the two may provide a ground voltage of the mobile device 100. For example, the ground metal portion 140 may be a ground copper foil, which may extend from the metal back cover 110 to the first surface E1 of the dielectric substrate 130. In detail, the ground metal portion 140 has an extending portion 145 on the first surface E1 of the dielectric substrate 130, and the extending portion 145 of the ground metal portion 140 may be substantially straight. As shown in FIG. 1B, the mobile device 100 may further include a Plastic Supporting Element 190. The Plastic Supporting Element 190 may be disposed on the metal back cover 110 and may be used to support and fix the dielectric substrate 130. The shape and size of the plastic supporting element 190 are not particularly limited in the present invention. It must be understood that the plastic supporting element 190 is an optional element and can be removed in other embodiments.

The first radiating part 150 has a feeding point FP, which can be coupled to a signal One of the signal source 199 is Positive Electrode, and one of the signal sources Negative Electrode is coupled to the ground metal part 140. For example, the signal source 199 may be a radio frequency (RF) module, which can be used to generate a transmitted signal or process a received signal to excite the aforementioned antenna structure. In some embodiments, the positive electrode of the signal source 199 is coupled to the feeding point FP through a Central Conductive Line of a coaxial cable, and the negative electrode of the signal source 199 is connected through the coaxial cable. A conductive housing is coupled to the ground metal portion 140. The first radiation portion 150 extends across the slot 120 of the metal back cover 110. That is, the first vertical projection of the first radiation portion 150 on the metal back cover 110 is at least partially overlapped with the slot 120. In some embodiments, the first radiation portion 150 is substantially T-shaped. In detail, the first radiating portion 150 has a first end 151, a second end 152, and a third end 153. The feeding point FP is located at the first end 151 of the first radiating portion 150, and the first The second end 152 and the third end 153 of a radiating portion 150 may extend substantially in opposite directions. The first radiation portion 150 may further have an unequal width structure. For example, the width of the third end 153 of the first radiating portion 150 may be greater than the width of the second end 152 of the first radiating portion 150 to fine-tune the impedance matching of the antenna structure. In addition, a coupling gap GC1 can be formed between the third end 153 of the first radiating portion 150 and the extending portion 145 of the ground metal portion 140.

The second radiating portion 160 extends across the slot 120 of the metal back cover 110. That is, a second vertical projection system of the second radiation portion 160 on the metal back cover 110 at least partially overlaps the slot 120. In addition, the first vertical projection of the first radiating portion 150 and the second vertical projection of the second radiating portion 160 at least partially overlap. in In some embodiments, the second radiating portion 160 is substantially T-shaped. In detail, the second radiating portion 160 has a first end 161, a second end 162, and a third end 163. The second end 162 and the third end 163 of the second radiating portion 160 may be substantially opposite to each other. For extension. The second radiating portion 160 may have an unequal width structure. For example, the width of the second end 162 of the second radiating portion 160 may be greater than the width of the third end 163 of the second radiating portion 160 to fine-tune the impedance matching of the antenna structure.

In some embodiments, the mobile device 100 further includes at least one first penetrating element (Via Element) 181 made of a metal material, wherein the first penetrating element 181 penetrates the dielectric substrate 130 and is coupled to the first radiation portion. Between the first end 151 of 150 and the first end 161 of the second radiation portion 160. It must be understood that the first through element 181 is an optional element, and it may be removed in other embodiments. If there is a first through element 181, the second radiating portion 160 is directly excited by the signal source 199; if there is no first through element 181, the second radiating portion 160 is coupled and excited by the first radiating portion 150. Neither of these two excitation methods affects the radiation performance of the antenna structure. In some embodiments, the mobile device 100 further includes at least one second penetrating element 182 made of a metal material, wherein the second penetrating element 182 penetrates the dielectric substrate 130 and is coupled to the extending portion of the ground metal portion 140. 145. It must be understood that the second through-element 182 is also an optional element, which can be removed in other embodiments. In addition, the number of the first through-elements 181 and the second through-elements 182 can be adjusted according to different needs.

The third radiation portion 170 extends across the slot 120 of the metal back cover 110. That is, a third vertical projection system of the third radiation portion 170 on the metal back cover 110 at least partially overlaps the slot 120. In addition, the third vertical portion of the third radiating portion 170 The direct projection at least partially overlaps with the second vertical projection of the second radiating portion 160. In some embodiments, the third radiating portion 170 is substantially rectangular. The third radiating portion 170 is coupled to the second end 152 of the first radiating portion 150 to provide an additional current path and increase the operating bandwidth of the antenna structure. It must be understood that the third radiating portion 170 is an optional component, and it may be removed in other embodiments.

In general, the ground metal portion 140, the first radiating portion 150, the second radiating portion 160, and the third radiating portion 170 are closer to the second closed end 122 of the slot 120 and farther from the first closed end of the slot 120端 121。 121. That is, the ground metal portion 140, the first radiating portion 150, the second radiating portion 160, and the third radiating portion 170 are located between the center point of the slot 120 and the second closed end 122, but not between the slot Between the center point of 120 and the first closed end 121. In addition, each of the first radiating portion 150, the second radiating portion 160, and the third radiating portion 170 may extend across the entire width W1 of the slot 120. According to the actual measurement results, this component arrangement can optimize the impedance matching of the antenna structure.

In some embodiments, the mobile device 100 and its antenna structure are implemented in a Deformable Device, which can switch between a notebook mode and a tablet mode. FIG. 2A is a schematic diagram illustrating the mobile device 100 operating in a notebook mode according to an embodiment of the present invention. FIG. 2B is a schematic diagram illustrating the mobile device 100 operating in a tablet mode according to an embodiment of the present invention.

FIG. 3A is a voltage standing wave ratio (VSWR) diagram of an antenna structure when the mobile device 100 according to an embodiment of the present invention is operated in a notebook mode. Figure 3B shows a The voltage standing wave ratio diagram of the antenna structure when the mobile device 100 described in the embodiment is operated in the tablet mode. According to the measurement results in Figures 3A and 3B, whether in notebook mode or tablet mode, the antenna structure of the mobile device 100 can cover a first frequency band FB1 and a second frequency band FB2, where the first frequency band FB1 can be approximately between 2400MHz to 2500MHz, and the second frequency band FB2 may be between 5150MHz and 5850MHz. Therefore, the antenna structure of the mobile device 100 can support at least 2.4GHz / 5GHz broadband operation of Bluetooth and WLAN (Wireless Local Area Network). According to the actual measurement results, the antenna efficiency of the antenna structure of the mobile device 100 in the first frequency band FB1 is about -3.5dB, and the antenna efficiency in the second frequency band FB2 is about -4.09dB. It can meet the practical application requirements of general mobile communication devices.

In some embodiments, the operating principle of the antenna structure of the mobile device 100 may be as follows. The first radiating portion 150, the second radiating portion 160, the third radiating portion 170, and the slot 120 of the metal back cover 110 are jointly excited to generate the aforementioned first frequency band FB1. On the other hand, the first radiating portion 150, the second radiating portion 160, and the third radiating portion 170 are collectively excited to generate the aforementioned second frequency band FB2.

In some embodiments, the component dimensions of the mobile device 100 may be as described below. The length of the slot 120 (ie, the length from the first closed end 121 to the second closed end 122) may be approximately equal to 0.5 times the wavelength (λ / 2) of the aforementioned first frequency band FB1. The length from the first end 151 of the first radiating portion 150 to the edge of the third radiating portion 170 through the second end 152 to the third radiating portion 170 may be approximately equal to 0.25 times the wavelength (λ / 4) of the aforementioned first frequency band FB1. The length from the first end 151 to the third end 153 of the first radiating portion 150 may be approximately equal to 0.25 times the wavelength (λ / 4) of the aforementioned second frequency band FB2. The length from the first end 161 to the second end 162 of the second radiating portion 160 may be substantially equal to the aforementioned first frequency. With 0.25 times the wavelength of FB1 (λ / 4). The length from the first end 161 to the third end 163 of the second radiating portion 160 may be approximately equal to 0.25 times the wavelength (λ / 4) of the aforementioned second frequency band FB2. In order to strengthen the coupling effect between the components, the width of the coupling gap GC1 can be less than 3.5mm, the thickness TK1 of the dielectric substrate 130 (or the distance between the first surface E1 and the second surface E2) can be less than 0.8mm, and the height of the plastic supporting component 190 H1 (or the distance between the second radiating portion 160 and the metal back cover 110) may be between 2 mm and 3 mm. The above component size range is obtained based on the results of multiple experiments, which helps to optimize the operating frequency band and impedance matching of the antenna structure of the mobile device 100.

The following embodiments will introduce different configurations of the proposed antenna structure, but the drawings and descriptions thereof are merely examples, and are not intended to limit the scope of the present invention.

FIG. 4 is a top view of a mobile device 400 according to an embodiment of the present invention. Figure 4 is similar to Figure 1A. In the embodiment of FIG. 4, the mobile device 400 does not include the first through element 181 and the second through element 182. Under this design, the second radiating portion 160 can still be coupled and excited by the first radiating portion 150 without affecting the radiation performance of the antenna structure. The remaining features of the mobile device 400 in FIG. 4 are similar to the mobile device 100 in FIG. 1A and FIG. 1B, so the two embodiments can achieve similar operating effects.

FIG. 5 is a top view of a mobile device 500 according to an embodiment of the present invention. Figure 5 is similar to Figure 1A. In the embodiment of FIG. 5, the mobile device 500 also does not include the first through element 181 and the second through element 182, and one of the second radiating portions 560 of the mobile device 500 is floating and has an L-shape. . The second radiating portion 560 may be partially parallel to the slot hole 120 and partially perpendicular to the slot hole 120. In detail, the second radiating portion 560 has a first end 561 and a second end 562, both of which are open ends, and the second radiating portion 560 The second end 562 is covered by the vertical projection of the extending portion 145 of the ground metal portion 140. The length of the second radiating portion 560 (that is, the length from the first end 561 to the second end 562) may be approximately equal to 0.5 times the wavelength (λ / 2) of the aforementioned first frequency band FB1. According to the actual measurement result, the shape and length adjustment of the second radiating portion 560 can be used to increase the bandwidth of the first frequency band FB1 of the antenna structure of the mobile device 500. The remaining features of the mobile device 500 in FIG. 5 are similar to the mobile device 100 in FIG. 1A and FIG. 1B, so similar operation effects can be achieved in both embodiments.

FIG. 6 is a top view of a mobile device 600 according to an embodiment of the present invention. Figure 6 is similar to Figure 1A. In the embodiment of FIG. 6, the mobile device 600 does not include the first penetration element 181, the second penetration element 182, and the third radiation portion 170. Under this design, the aforementioned first frequency band FB1 can still be excited by the first radiating portion 150, the second radiating portion 160, and the slot 120 of the metal back cover 110 without affecting the radiation performance of the antenna structure. The length from the first end 151 to the second end 152 of the first radiating portion 150 may be substantially equal to 0.25 times the wavelength (λ / 4) of the second frequency band FB2 to increase the bandwidth of the second frequency band FB2. The remaining features of the mobile device 600 in FIG. 6 are similar to the mobile device 100 in FIG. 1A and FIG. 1B, so the two embodiments can achieve similar operating effects.

FIG. 7 is a top view of a mobile device 700 according to an embodiment of the present invention. FIG. 7 is similar to FIG. 1A; in the embodiment of FIG. 7, a grounded metal portion 740 of one of the mobile devices 700 has an extending portion 745 on the first surface E1 of the dielectric substrate 130, of which the grounded metal portion 740 The extending portion 745 may have a substantially L-shape, so that the second closed end 122 of the slot 120 is completely covered by the vertical projection of the extending portion 745. A coupling gap GC2 can be formed between the third end 153 of the first radiation portion 150 and the extending portion 745 of the ground metal portion 740. The width of the coupling gap GC2 may be less than 3.5 mm. According to the actual measurement results, the L-shaped extension portion 745 can be used to increase the bandwidth of the aforementioned second frequency band FB2. The remaining features of the mobile device 700 in FIG. 7 are similar to the mobile device 100 in FIG. 1A and FIG. 1B, so similar operation effects can be achieved in both embodiments.

FIG. 8 is a top view of a mobile device 800 according to an embodiment of the present invention. Figure 8 is similar to Figure 1A. In the embodiment of FIG. 8, the mobile device 800 further includes a fourth radiation portion 860 made of a metal material. The fourth radiating portion 860 is disposed on the second surface E2 of the dielectric substrate 130. The fourth radiating portion 860 extends across the slot 120 of the metal back cover 110. That is, a fourth vertical projection system of the fourth radiation portion 860 on the metal back cover 110 at least partially overlaps the slot 120. The fourth radiating portion 860 generally has an inverted T shape. In detail, the fourth radiating portion 860 has a first end 861, a second end 862, and a third end 863, which are all open ends, and the second end 862 and the third end of the fourth radiating portion 860 863 can extend in approximately the opposite direction. The fourth radiating portion 860 may have a constant-width structure. For example, the first end 861, the second end 862, and the third end 863 of the fourth radiation portion 860 may all have equal widths. The length from the first end 861 to the second end 862 of the fourth radiating portion 860 may be greater than the length from the first end 861 to the third end 863 of the fourth radiating portion 860. In some embodiments, at least one second penetrating element 182 penetrates the dielectric substrate 130, and the second penetrating element 182 is coupled between the extending portion 145 of the ground metal portion 140 and the fourth radiating portion 860. According to the actual measurement result, the addition of the fourth radiating part 860 can increase the bandwidth of the first frequency band FB1 and the second frequency band FB2 at the same time. It must be understood that the second through element 182 is also an optional element, which can be removed in other embodiments (in this case, the fourth radiating portion 860 is floating). The remaining features of the mobile device 800 in FIG. 8 are the same as those of the mobile device 100 in FIGS. 1A and 1B. They are similar, so the two embodiments can achieve similar operating effects.

The invention proposes a novel antenna structure, which includes a slot. When this antenna structure is applied to a mobile device with a metal back cover, the metal back cover can be regarded as an extension of the antenna structure, so metal can be effectively avoided. The back cover has a negative impact on the communication quality of the mobile device. When the mobile device is a deformable device, whether it is operated in a notebook mode or a tablet mode, the antenna structure can exert good radiation performance. It should also be noted that the present invention can further improve the appearance design of the mobile device without using any Antenna Window on the metal back cover. Compared with the traditional design, the present invention has at least the advantages of small size, wide frequency band, improved high and low frequency antenna efficiency, increased device stability, and beautifying the appearance of the device, so it is very suitable for various mobile communication devices. .

It is worth noting that the above-mentioned component size, component shape, and frequency range are not the limiting conditions of the present invention. The antenna designer can adjust these settings according to different needs. The mobile device and antenna structure of the present invention are not limited to the state shown in Figs. 1-8. The invention may include only any one or more features of any one or more of the embodiments of Figures 1-8. In other words, not all the illustrated features must be implemented in the mobile device and antenna structure of the present invention at the same time.

The ordinal numbers in this specification and the scope of patent application, such as "first", "second", "third", etc., do not have a sequential relationship with each other, they are only used to indicate that two have the same Different components of the name.

Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the scope of the present invention. Any person skilled in the art will not depart from the present invention. Within the spirit and scope, some modifications and retouching can be done. Therefore, the scope of protection of the present invention shall be determined by the scope of the attached patent application.

Claims (19)

A mobile device includes: a metal back cover with a slot; a dielectric substrate having a first surface and a second surface opposite to each other, wherein the second surface of the dielectric substrate faces the slot; a ground A metal portion is coupled to the metal back cover and extends to the first surface of the dielectric substrate; a first radiating portion having a feeding point and disposed on the first surface of the dielectric substrate, wherein A first vertical projection system of the first radiation portion on the metal back cover at least partially overlaps the slot, and a coupling gap is formed between the first radiation portion and the ground metal portion; and a second radiation A second vertical projection of the second radiating portion on the metal back cover at least partially overlaps with the slot, and the first radiating portion of the second radiating portion is at least partially overlapped with the slot. The two vertical projections at least partially overlap the first vertical projection of the first radiation portion, and the overlapped portion does not overlap at least partially with the slot; wherein the first radiation portion and the second radiation portion , And the slot system of the metal back cover The same antenna structure is formed. The mobile device according to item 1 of the scope of patent application, wherein the slot is a closed slot. The mobile device according to item 1 of the scope of patent application, wherein the ground metal portion is a ground copper foil. The mobile device according to item 1 of the scope of patent application, wherein the first radiating part is T-shaped. The mobile device according to item 1 of the scope of patent application, wherein the second radiating part is T-shaped. The mobile device according to item 1 of the scope of patent application, further comprising: a first penetrating element penetrating the dielectric substrate, wherein the first penetrating element is coupled to the first radiating portion and the second radiating portion. between. The mobile device according to item 1 of the scope of patent application, further comprising: a third radiating portion, coupled to the first radiating portion, and disposed on the first surface of the dielectric substrate, wherein the third radiating portion A third vertical projection system on the metal back cover at least partially overlaps the slot. The mobile device according to item 7 of the scope of patent application, wherein the third radiating portion is rectangular. The mobile device according to item 7 of the scope of patent application, wherein the antenna structure includes a first frequency band and a second frequency band, the first frequency band is between 2400 MHz and 2500 MHz, and the second frequency band is between 5150 MHz To 5850MHz. The mobile device according to item 9 of the scope of patent application, wherein the first radiating portion, the second radiating portion, the third radiating portion, and the slot of the metal back cover are used to excite the first frequency band. . The mobile device according to item 9 of the scope of patent application, wherein the first radiating portion, the second radiating portion, and the third radiating portion are used to excite the second frequency band. The mobile device according to item 9 of the scope of patent application, wherein the length of the slot is equal to 0.5 times the wavelength of the first frequency band. The mobile device according to item 1 of the scope of patent application, wherein the second radiating portion is floating and presents an L-shape. The mobile device according to item 1 of the scope of patent application, wherein the grounded metal portion has an extended portion on the first surface of the dielectric substrate, and the extended portion has a straight bar shape or an L shape. The mobile device according to item 14 of the scope of patent application, wherein the coupling gap formed between the first radiating portion and the extending portion of the ground metal portion is less than 3.5 mm. The mobile device according to item 14 of the scope of patent application, further comprising: a fourth radiating portion disposed on the second surface of the dielectric substrate, wherein the fourth radiating portion is one of the fourth radiating portions on the metal back cover. The vertical projection system at least partially overlaps the slot. The mobile device according to item 16 of the scope of patent application, wherein the fourth radiating part is in an inverted T shape. The mobile device according to item 16 of the scope of patent application, further comprising: a second penetrating element penetrating the dielectric substrate, wherein the second penetrating element is coupled to the extension portion of the ground metal portion and the first Between the four radiation departments. The mobile device according to item 1 of the scope of patent application, wherein the thickness of the dielectric substrate is less than 0.8 mm.